/Engine/Source/Runtime/Engine/Public/MaterialShared.h
class FMaterialVirtualTextureStack
int32[8]
LayerUniformExpressionIndices
Indices of the expressions that were set to layers in this stack.
uint32
NumLayers
Number of layers that have been allocated in this stack.
int32
PreallocatedStackTextureIndex
Indexof a texture reference if we create a stack from a single known texture that has it's own layer stack.